Car truck



Sept. 13, 1938. A. CHRISTIANSON AL 2,129,910

CAR TRUCK Filed Dec. 17, 1936 s Sheetg-Sheet 1 Sept. 13, 1938.

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Q U CAR TRUCK Filed Dec. 17, 1935 v s Sheets-Sheet s"'I'III'IIIIIIIIIInIIIIIIII Patented Sept. it 1 dndrew Christian,llabelmann, Gm

her 17, 1936, Serial No. Ill-636th 1 pplication in.

14L 31mm The invention relates to car trucks generally and hasparticular reference to the truck frame and bolster suspensionmechanism.

.vide triple spring suspension means designed to eliminatesynchronization of the springs and thereby to insure stability ofoperation of the lib truck and prevent transmission ofvibration-resulting from. rail and wheel impacts.

An important object is to provide triple suspension means involvingsprings having freguencies of different values so that vibrations set upby abrupt changes in the direction and magni tude of the loads appliedat the several springs will not be synchronized.

A particular object is to provide cushioning and stabilizing means forthe bolster swing hangers intermediate the bolster elliptic springs andthe springs at the journal boxes, thev intermediate cushioning meansbeing supported .by aurdliary swing hangers suspended vertically fromthe truck frame.

The foregoing and other objects are attained by the mechanismillustrated in the accompanying drawings, in which-- Fig. l is a generalplan oi a car truck embodying the invention;

Fig. 2 is a view of the truck in side elevation with. a portion thereofin cross-section taken on line 2-2 of Fig. 1;

Fig. 3 is a vertical section taken transversely of the truck on line 3-3of Fig. 2, through bolster and spring plank;

i Fig. 4, is a horizontal section through truck frame pedestal andadjacent portion of journal box taken on line 44 of Fig. 2;

Fig. 5 is a similar view through the transoms of the truck frame takenon line 5--5 of Fig. 6, showing intermediate cushioning support;

Fig. 6 is a vertical section taken transversely of the truck on line 6-6of Fig. 1, through one of the truck frame transoms showing theintermediate cushioning assembly;

Fig. '7 is a similar view showing the intermediate cushioning assemblymodified for use with trucks having inboard frame members; and

Fig. 8 is an enlarged fragmentary horizontal sectional view through theJoint between the spring caps and connecting bar taken on line 88 ofFig. 7'.

The invention is carried out by mounting the truck frame wheel pieces l0upon coil springs l5 of a given deflection value supported upon thejournal boxes 20 so that the load reactions thence would flow toauxiliary swing hangers 25, sue

and, Hindi, and (bite -1- Nebr.

pended vertically and in parallel from the truck frame transoms H, tospring seats 26 through intermediate springs 21 of relatively highfrequency value, thence to separate and independent continuous cap beams28 bearing pivots- 29 at each transom H for supporting separate bolsterswing hangers 30, to spring plank 3| through elliptic springs 32 havinga relatively low irequency value, thence to the bolster 35. By theprovision of springs of different frequencies, the vibrations set up atthe wheel are offset by those at the other positions and caused to beoverlapped, thereby to prevent the building-up of the combined recoilvalues of the several springs. By .the use of relatively high frequencysprings intermediate those at the journal box and the bol ster ellipticsprings, the bolster swing hanger supportingpivots 29 remainsubstantially quiescent and undisturbed by the relatively greatermovements of the bolster and truck frame with respect to the railwhereby the reactions to truck movement over high spots and depressionsin the track will not be communicated to the car body.

As outlined in the drawings, the invention may be adaptedto eitheroutboard or inboard types of truck frame. Figs. 1 through 6 depict theout= board framing members l0 between which are the connecting transommembers I l and end sills I2 with pairs of wheels I 3 on axles llpositioned between said transoms and respective end sills as incustomary practice. In the embodiment shown, the main supporting springsii are sup ported upon seats II on journal boxes 20 in planessubstantially below the center line of the axles It? to minimize thetendency of the springs to upset under braking or starting thrusts orlaterally when rounding curves.

The frames are formed with spring caps it designed to receive and holdin place the springs l5 upon opposite sides of the journal boxes 20,although the supporting springs l5 may be mounted on top of the boxesshould that arrangement be desired or when the space beneath the carfloor will permit, but the relatively stable disposition of the springson seats below the axle center, as shown, is preferred.

The connecting transoms II are preferably hollow and rigid with thewheel pieces In and formed each with top web l9 and side wall members 2|reinforced by flanges 22 along their lower edges spaced apart to admitthe auxiliary suspension elements comprising the vertical hanger links25, the springs 21, the continuous spring connecting beam 28, the springseats 26, and inclined bolster swing hanger arm 30, as best shown inFigs. 1, 2,

IND

5 and 6. The transoms are provided on their upper sides with bearings 23for the pivots 24 of hangers 25 and openings 33 to receive bearings 34on the spring 'cap connecting beams 28 for the bolster swing hangerpivots 29. The transoms are extended outwardly beyond the wheel piecesID to provide supports for separate brake cylinders 36 actuating theindependent brake riggings 31 for each wheel.

Under thrust of loads tending to shift the bolster 35 from the normalposition indicated in the half-section view in Fig. 3, a movement to theleft will cause the inclined bolster swing hanger 39 on the side shownto assume a greater angularity with respect to the spring plank 3| toshorten the hanger arm and compress adjacent bolster spring 32 under theincreased load imposed, whereby the springs on the opposite side of thetruck will be relieved of a part of their load by the lengthening of thebolster hanger arm on that side and resultant lowering of the adjacentend of the spring plank. The force of the thrust applied at the bolsterhanger pivot 29 is communicated to its bearing 34 on continuous springcap beam 28 and transmitted through springs 21 to seat 26 suspended fromthe truck frame by the parallel hangers 25 arranged normally verticalfor purposes hereinafter outlined.

As the hangers 25 move from their normal vertical position under theload imposed by the bolster hanger pivot 29, the springs 21 arecompressed as the angulanty of the hanger arms 25' increases to opposemovement of such pivot outwardly towards adjacent side frame by a thrustin the opposite direction under the pent-up energy of the compressedauxiliary springs. The force of the thrust upon pivot 29 subsides at a'rate corresponding to the increase in the pressure on the springs 21until the limit of movement has been reached forthe pivot, whereupon thestored energy in the springs is released to restore said pivot and.hangers 25 to their normal positions of rest. Neutralization of forcesand restoration of pivot position are effected without shock by virtueof the initial vertical disposition of all the hangers 25 whereby normalswinging movements are absorbed without appreciably communicatingvibrations to the bolster hanger pivots 29 and result from the greaterinitial arc of movement of the vertically disposed auxiliary hangers atthe spring seats 26 than is possible with hangers normally inclined withrespect to the seats.

Because of ti e initially vertical disposition of the hangers 25, theabrupt lift of auxiliary spring seats 26 on one side of the truck andcompensating drop of companion seats on opposite side are avoided,whereby the spring cap connecting beam 28 supporting the bolsterassembly is held in p0- sition to become immediately effective yieldablyto restrain lateral displacement of bolster hanger pivots 29 andindependently of the direction of bolster movement laterally of thetruck. With the auxiliary hangers 25 at one end of the continuous springbeam 28 disposed in parallelism with similar hangers at the oppositeend, the spring seats 26 will both of them move in planes parallel to ahorizontal plane through pivots 24 of these hangers to maintain, throughauxiliary springs 21, the spring connecting beam 28 substantiallystable, and through said beam the pivofs 29 of bolster swing hangers onopposite sides of the truck are held fixed with respect to each other topermit the described movement of the bolster when suspended by hangers30 inclined as indicated.

The spring cap connecting beams 28 are illustrated in Figs. 1 and 6 asrigid members extending from the auxiliary-springs 21 on one side of thetruck to the auxiliary springs 21 on the opposite side of the truckwithin the respective transoms upon opposite sides of the bolster 35.The spring caps, thus connected, function to prevent nosing of the capsoutwardly under the influence of the weight of the bolster assemblycarried by the inclined bolster swing hangers 30 which, be-

cause of such inclination, tend to shift the pivots 29, with theirbearings 34, towards a plane passing through the point of application ofthe load at the respective swing hanger crossbars 38 held apart by thespring plank 3|. If desired, the spring caps may be connected by aseparate member somewhat after the fashion indicated in Fig. 7hereinafter to be described.

It will be noted that the spring cap beam members 28 on one side of thebolster35 are mounted separately and independently of the spring capbeam members 28 on the opposite side of the bolster, and the movementsof one member are not communicated to the other since there is no directconnection between them. The bolster swing hangers 39, supported fromthe cap beam members 28, move with their respective members and inresponse to the loads imposed on such members. The hangers 39 areconnected by separate crossbars 38 bridging the space between them toserve at once as supports for the spring plank 3| holding inclined thebolster swing hangers and as equalizers for breaking up the longitudinalrocking of the truck frame to prevent transmission of such movement tothe spring plank whereby the bolster is held from tilting about its axisduring train movement.

As the result of the use of said crossbars 38 as equalizers, a high spotin the rail striking the forward wheel of the truck moving in thedirection indicated by the arrow in Fig. 2, would cause that end of'thetruck to rise an amount determined by the force of impact. Such movementwould cause a proportional rise in the adjacent transom supporting theauxiliary suspension springs 21, but, owing to the inertia of thebolster, the springs 21 will yield to permit the bolster swing hangerpivots 29 atthat side of the bolster to drop relatively to said transomto compensate for the rise of the truck frame l9 whereby the crossbars38 will be leveled-out to preserve the bolster equilibrium. Obviously, amovement of the truck in the opposite direction would give rise to asimilar sequence of operations in the members on the opposite side ofthe bolster to effect the same result.

As best shown in Figs. 5 and 6, the auxiliary spring seats 26 may alsobe connected,.for simultaneous operation, to the seats on the oppositeside of the truck by bar members 39 pivotally secured by headed bolts40. The bars 39 are formed preferably as shown with jaws 4| to receivebetween them the inner end of the spring seat 26 and the bolt 40inserted to connect them. To prevent chattering of the parts, a metalclip 42, perforated to receive the bolt 40 and bent at its ends toprovide contact portions 43, is mounted on the shank of the bolt inposition to effect contact between one of the clip ends 43 and thespring seat 26 and between the bar 39 and the opposite end 43 of theclip with the body of the clip spaced from the jaw 4| so that thepressure of spring 44 held by nut 45 against'the plate will urge theends of the clip against the connected members in opposition to the pullof the bolt head under tension of the spring 48, whereby the joint willprovide sufiicient flexibility of movement between the connected partsto permit possible angularities with respect to each other during theswinging movements 01 the seats. I

The invention may be adapted to truck frames of the inboard typeindicated'in Fig. 7 at 868 wherein the transoms iii extend beyond thewheel pieces to provide support for the bolster swing hangers 836. Inthis embodiment, the auxiliary spring suspension is modified to theextent of disposing the intermediate outer and inner hanger links H25and i251: upon opposite sides of the wheel pieces and the bolster swinghangers 530 between the frame and outer auxiliary suspension hanger E25.

The outer hangers are suspended from pivots G2 3 on bearings M3 on thetransoms Hi and the inner hangers i25a suspended from pivots tide onbearings 823a carried by the wheel pieces. Both hangers E25 and 5250,are connected at their lower ends by spring seats I26 to which thehangers are secured by pivots i251) and 8250 respectively. An outerspring i2? and a relatively light inner spring 927a are mounted uponsaid seats, and spring cap beams tit supported upon the springs formounting the bolster swing hangers 03B by pivots H29 journaled inbearings 63% on supporting pedestal 9553. I

The spring caps 62b of the modified embodiment are connected together asin the rigid form previously described and shown in Fig. 6, except thata separate connecting bar 51! is joined at its end to separate adjacentcaps G28 and connection efiected by headed bolts 52 passing throughembossments 5 5 on the bar and openings 55 in brackets 53 on the caps82%. The bar and spring beams are insulated by rubber gaskets 56surrounding the embossments 5d and preferably formed with base flanges57 entered in recessed seats 58 on the bar iii to prevent metal-to-metalcontact between the parts. The embossments 5t and openings 55 arepreferably tapered as shown in Fig. 8 to permit the proper nesting ofthe gaskets 55 within the openings and provide a compensating take-upfor wear. The bracket openings 55 are covered on the contracted side bywashers 59 against which are seated the nuts t fitted to the bolts 52 sothat when the bolts are secured in position the gasket 56 will operateto cushion the pull of the bar i on the spring beams ifit tendingfurther to prevent transmission of vibration to the hangers 53d.

In the modified form, the outer and inner hangers M5 and i254; are ofthe single link type and extend axially through their respective springs62? and Mia, the outer springs and hangers being heavier and of greatercapacity than their companion inner members since the bolster swinghangers we are mounted upon the cap beams 82B relatively close to theouter auxiliary hangers 92 5 thereby to impose approximately two-thirdsof their respective loads upon said hangers, whereby the remainder ofthe load is carried by the relatively light inner hangers and springsl25a and 52712, respectively, farther removed from the bolster hangersISd. Since the springs 62? and i2'ia are of different frequencyvalue,'the vibrations thereof overlap and are thus dampened to preventsynchronization and thereby further to prevent the transmission ofgalloping movements to the bolster hangers 536.

Further to reduce vibration in the bolster hangers, the bearingpedestals 50 on spring cap beams 28 shown in Figs. 5 and 6 may belowered until the centers of bolster hanger pivots .29 are positioned ina plane lower than the axes of auxat the spring plank position. As bestshown in Fig. 3, the equalizers 38 between the bolster hangers 36 uponopposite sides of the bolster 35 may be fitted with wearing pieces 36having relatively large arcuate bearing surfaces 3'? nested withinrespectively adjacent, complemental, recessed bearings its on the springplank 3i, the pieces being formed with side leg portions 69 closely toembrace the underlying equalizers 38, whereby the additional frictionthus obtained will operate further to dampen the movements of thebolster swing hangers to the end that the bolster hanger pivots shall berelieved of all possible strains and vibration to prevent transmissionthereof to the car body.

Further to prevent the transmission of vibrations from the wheels to thetruck frame 1 cushioning means is introduced between the pedestals tioi. the truck frame and journal boxes 2d. The cushioning assemblycomprises a securing plate t2, channel-shaped with its flanges t3 weldedat be to' the pedestals, an outer wear plate 65 also channel-shaped withits web and flanges spaced from the inner plate 62, and a rubber bushingSt between and bonded to said plates. To provide for the flow of thebushing rubber under pressure in the web areas of the plates 62 and 65,the bushing is formed with openings $77 at spaced intervals throughoutits length and width as bestshown in Fig. 4. The plates and bushing arepreferably assembled on the bench and secured as a unit to the pedestals'68, as indicated in Figs. 1, 2 and 4. I

The journal boxes 28 of the present embodiment are indicated as formedwith recesses to receive the pedestals 6i and respective cushioningassemblies. The recesses are channel-shaped and fitted with wearingplate liners having each a web 58 and side flanges 69 designedfrictionally to engage respectively continguous parts of the cushioningassemblies on the pedestals, whereby impact loads resulting from brakingoperations and other causes will be substantially reduced. As shown, thepedestals 8| of the frame slidabiy engage adjacent sides of therespective journal boxes through the medium of the cushion face side ofthe truck parallel to companion pairs of hangers on the opposite side ofthe truck, so that in operation, when the auxiliary spring seatssupported by hangers hung vertically at respectively opposite sides ofthe truck are shifted transversely by thrust of a load applied at eitherseat, the seats will be lifted simultaneously and in a common horizontalplane to prevent canting of the respective spring groups, the pressuresto be absorbed by the several springs of each group will be more equablydistributed, and forces tending to upset the springs are minimized oreliminated.

It will be noted that the bolster hangers 30 and I30 are movable betweenrespective pedestals 50 and I50 of the spring beams from which they arepivotally hung for movement under thrust transversely of the truck, andthat the hanger-sup-, .porting pivots 29 and I29 may be higher or lowerwith respect toauxiliary hanger pivots 25, I25 and I25a as hereinbeforestated. The range of movement of the bolster hangers at theopeningsnected, for simultaneous operation, to the seats on the oppositeside of the truck by bar members 39 secured at their ends to therespective seats,

as shown in Figs. 5 and 6. Obviously, and for the same purpose, theauxiliary spring seats I26 supported partially outside the truck framesI00 by hangers I25 and inside thereof by hangers I25a on the inboardtype of truck shown in Fig. 7, may also be connected as by the bar I39indicated in broken lines in this figure. The advantages inherent ineither embodiment are available for use in trucks having three pairs ofwheels, or more, involving one or more additional bolster assemblies asrequired.

What is claimed is:-

1. In a car truck having. journal .boxes and including a truck frame,springs on the boxes supporting the truck frame, a bolster mounted formovement in the truck frame, coil springs hung from the frameintermediate the box springs and bolster at each side of the truckadapted for independent operation upon opposite sides of the bolster andsupporting spring beams continuous between coil springs at oppositesides of the truck, elliptic springs between said intermediate springsand the bolster for supporting the bolster, separate bolster hangerspivotally mounted on said spring beams, equaliflng bars connecting saidhangers, and a spring plank supported upon said bars for connecting saidhangers transversely of the truck and supporting said elliptic springs.

2. In a car truck having journal boxes and including a truck framecomprising side frames and connecting transom members spaced apart,springs supporting said frame from the boxes, 9. bolster supportedbetween said transoms, spring beam assemblies hung from said transomsfor independent movement upon opposite sides of the bolster andcomprising each spring seats pivotally hung from the respectivetransoms, springs spaced apart on each of said seats, a continuousspring beam supported on said springs, bolster hangers pivotallysupported from opposite ends of said beam, equalizing bars connectingthe bolster hangers at adjacent assemblies, a spring plank supportedupon said bars for connecting said hangers transversely of the truck,and springs on said plank for supporting the bolster.

3. In a car truck having journal boxes and including a truck framehaving transom members spaced apart, springs of given deflection valuesupporting said frame from the boxes, a bolster mounted for movementbetween said transoms, spring beam assemblies hung from said transomsfor independent movement upon opposite sides of the bolster and eachincluding spring seats, springs of relatively high frequency valuespaced apart on said seats, a cap beam supported on said springs,hangers suspended vertically from the transom and pivotally secured tothe spring seats at respectively adjacent springs,

relatively inclined bolster hangers supported from opposite ends of saidcap beam and disposed between associated spring seat hangers, equalizingbars connecting the bolster hangers at adjacent assemblies, a. springplank supported upon said bars for connecting said hangers transverselyof the truck, and springs of relatively low frequency value on saidplank for supporting the bolster.

4. Ina car truck having journal boxes and including a truck frame.having transom members spaced apart, springs supporting said frame fromthe boxes, a bolster mounted for movement between said transoms,companion spring beam assemblies hung from said transoms for independentmovement upon oppositesides of the bolster and each including springseats, springs spaced apart on said seats, a cap beam supported on saidsprings, parallel hangers suspended vertically from the transom andpivotally secured to the spring seats at respectively adjacent springs,relatively inclined bolster hangers supported from opposite ends ofsaidcap beam and disposed between the beam hangers, equalizingassemblies, a spring plank supported upon said bars for connecting saidhangers transversely of the truck, springs on said' plank forsupporting' the bolster, and separate means connecting the spring seatsof companion assemblies.

5. A car truck including journal boxes, springs on said boxes, a truckframe supported on said springs and having side frames and connectingtransoms spaced apart and extending with their respective ends outwardlybeyond the side frames, a bolster movably supported between saidtransoms, companion spring beam assemblies hung at said transoms forindependent movement upon opposite sides of the bolster and eachincluding a spring seat, springs on said seat arranged upon oppositesides of adjacent side frames, a cap beam supported ,on said springs,hangers vertically suspended from the truck frame and pivotallysecuredtothe spring seat at respectively adjacent springs, a relatively inclinedbolster hanger supported from said cap beam and disposed between theside frame and one of said seat hangers, equalizing bars connecting thebolster hangers at adjacent assemblies, a spring plank supported uponsaid bars for connecting said hangers transversely of the truck, andsprings on said plank for supporting the bolster.

I 6. A car truck including journal boxes, springs on said boxes, a truckframe supported on said springs and having side frames and connectingtransoms spaced apart and extending with their respective ends outwardlybeyond the side frames, a bolster movably supported between saidtransoms, companion spring beam assemblies hung at said transoms forindependent movement upon opposite sides of the bolster and eachincluding a spring seat, relatively high and low frequency springs onsaid seat outwardly and inwardly of the side frames respectively, a capbeam support ed on said springs, hangers suspended vertically from thetruck frameand pivotally secured to the spring seat at respectivelyadjacent springs, a relatively inclined bolster hanger pivotallysupported on said cap beam from a bearing disposed between said outersprings and adjacent side frame and in a plane below the points ofsupport on the truck frame for the spring seat 2,129,910 I soms,companion spring bearfi assemblies hung hangers, equalizing barsconnecting the bolster hangers at adjacent assemblies, a spring planksupported upon said bars for connecting said hangers transversely of thetruck, and elliptic springs on said plank for supporting the bolster.

-7. A car truck including journal boxes, springs on said boxes, a truckframe supported on said springs and having side frames and connectingtransoms spaced apart and extending with their respective ends outwardlybeyond the side frames, a bolster movably supported between saidtransoms, companion spring beam assemblies hung at said transoms forindependent movement upon opposite sides of the bolster and eachincluding a spring seat, springs on said seat arranged upon'oppositesides of adjacent side frames, a cap beam supported on said springs,hangers suspended vertically from. the truck frame and pivotally securedto the spring seat at respectively adjacent springs, a relativelyinclined bolster hanger supported from said cap beam and disposedbetween the side frame and one of said seat hangers, equalizing barsconnecting the bolster hangers at adjacent assemblies, a spring planksupported upon said bars for connecting said hangers transversely of thetruck, springs on said plank for supporting the bolster, and meansconnecting the cap beams of spring assemblies on one side of the bolsterfor simultaneous operation.

8. A car truck including journal boxes, springs on said boxes, a truckframe supported onsaid springs and having side frames and connectingtransoms spaced apart and extending with their respective ends outwardlybeyond the side frames for supporting brake riggings, a bolster movablysupported between said transoms and riggings, companion springassemblies hung from said transoms for independent movement uponopposite sides of the bolster and each including a spring seat, springsspaced apart on said seat, a cap beam supported on said springs, hangerssuspended vertically from the transom and pivotally secured to thespring seat at respectively adjacent springs, a relatively inclinedbolster hanger supported from said cap beam and disposed be:-

tween the seat hangers, equalizing bars connecting the bolster hangersat adjacent assemblies, a spring plank connecting said bars for holdingsaid bolster hangers inclined, springs on said plank for supporting thebolster, and arcuate bearing surfaces on said equalizing bars and springplank.

9. In a car truck including journal boxes, springs on said boxes, atruck frame supported on said springs, othercushioning means supportedon said frame and engageable with said boxes, a bolster movably mountedin saidframe intermediate the last-named cushioning means, springassemblieshung from said frame for independent movement upon oppositesides of the bolster, separate bolster hangers pivotally mounted on saidspring assemblies, equalizing bars connecting said hangers betweenadjacent assemblies, a spring plank supported upon said bars forconnecting said hangers transversely of the truck, springs on said plankfor supporting the bolster, and cushioned connections between springassemblies on respective sides of the bolster.

10. A car truck including journal boxes, springs at said transoms forindependent movement upon opposite sides of the bolster and comprisingeach a spring seat pivotally secured to the respective transoms and sideframes, springs on said seat arranged upon opposite sides of adjacentside frames, a cap beam supported on said springs, hangers in parallelsuspended vertically from the truck frame and pivotally secured to thespring seat at respectively adjacent springs, a relatively inclinedbolster hanger supported from said cap beam and disposed between theside frame and one of said seat hangers, equalizing bars connecting thebolster hangers at adjacent assemblies, aspring plank supported uponsaid bars for connecting said hangers transversely of the truck, springson said plank for yieldably supporting the bolster, and means forconnecting the spring seats of spring assemblies on one side of thebolster for simultaneous operation.

'11. In a car truck having journal boxes and including a truck framehaving side frames and connecting transom members "spaced apart, springssupporting the frame from said boxes,'a bolster supported between saidtransoms, spring assemblies hung from said transoms for independentmovement upon opposite sides of the bol ster and each including a springseat,- hangers in parallel suspended vertically, from said trainsoms andsecured pivotally thereto and to said spring seat, springs supported onsaid "seat, a transversely extending cap beam supported on said springs,a relatively inclined bolster hanger supported fromieach end of said capbeam and disposed, between adjacent seat hangers, equalizing barsconnecting the bolster hangers at adjacent assemblies, a spring plankconnecting the equalizing bars for holding the bolster hangers atopposite sides of the truck inclined, and springs on said plank forsupporting the bolster.

12. In a car truck having'journal boxes, springs on said boxes, a truckframe supported on said springs, a bolster mounted for movement withinthe frame, spring assemblies hung from said frame for independentmovement upon opposite sides of the bolster by hangers in parallelsuspended vertically from the truck frame and secured pivotally theretoand to respective spring assemblies, transverse connections between saidspring assemblies, a relatively inclined bolster hanger pivotallysuspended from each of the spring assemblies, equalizing bars connectingthe bolster hangers at adjacent assemblies, a spring plank connectingthe equalizing bars for holding the bolster hangers at opposite sides ofthe truck inclined, and springs on said plank for supporting thebolster.

13. A car truck including journal boxes, springs of a given deflectionvalue on the boxes, a truck frame supported upon said springs,,lseparate springs of relatively high frequency value independently hungfrom said frame intermediate said first mentioned springs at each sideof the truck. a bolster mounted for movement between said last mentionedsprings, transverse connections between said last mentioned springs atopposite sides of the bolster, equalizing bars connecting said lastmentioned springs, and springs of relatively low frequency value on saidequalizing bars supporting said bolster.

14. In a railway car truck comprising a frame supported upon wheels andaxles and having a triple spring-suspended bolster comprising coilsprings between the frame and axles, elliptic meeting said swinginglysuspended springs for causing simultaneous swinging movement of springsat opposite sides of the truck.

ANDREW CHRISTIANSON. OTTO JABELMIANN.

